5.2 Pulse amplitude modulation 5.2.1.PAM:geometric representation s(1)=Agr(t) 1)Basis function:()=kog(t) whereko=1E=g()di=the energy of the g(). The space is of 1-d and N=1.. 2)The signal vectors (points):s=(a) m=1,2,M where,,a.=snΨ，-∫Ag,)0dh E =AEs UESTC-Digital transmission through the AWGN channel Prof李晓峰 7